<template>
  <div :class="isShowCmtInput ? 'art-cmt-container-2' : 'art-cmt-container-1'">
    <!-- 评论列表 -->
    <div class="cmt-list" >
       <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多了"
        @load="onLoad"
        offset="50"
        :immediate-check="false"
      >
      <!-- 评论的 Item 项 -->
      <div class="cmt-item" v-for="item in shuju" :key="item.com_id">
        <!-- 头部区域 -->
        <div class="cmt-header">
          <!-- 头部左侧 -->
          <div class="cmt-header-left">
            <img :src="item.aut_photo" alt="" class="avatar">
            <span class="uname">{{ item.aut_name }}</span>
          </div>
          <!-- 头部右侧 -->
          <div class="cmt-header-right">
            <van-icon name="like" size="16" color="red" v-if="item.is_liking === true" @click="loveFn(true, item)"/>
            <van-icon name="like-o" size="16" color="gray" v-else @click="loveFn(false,item)" />
          </div>
        </div>
        <!-- 主体区域 -->
        <div class="cmt-body">
         {{ item.content }}
        </div>
        <!-- 尾部区域 -->
        <div class="cmt-footer">
          {{ item.pubdate}}
        </div>
      </div>
       </van-list>
    </div>

    <!-- 底部添加评论区域 - 1 -->
<div class="add-cmt-box van-hairline--top" v-if="isShowCmtInput === false">
    <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
    <div class="ipt-cmt-div" @click="isShowCmtInput = true">发表评论</div>
    <div class="icon-box">
        <van-badge :content="totalCount">
            <van-icon name="comment-o" size="0.53333334rem" @click="movefn" />
        </van-badge>
        <van-icon name="star-o" size="0.53333334rem" />
        <van-icon name="share-o" size="0.53333334rem" />
    </div>
</div>

<!-- 底部添加评论区域 - 2 -->
<div class="cmt-box van-hairline--top" v-else>
    <textarea v-fofo v-model="comValue" placeholder="友善评论、理性发言、阳光心灵" @blur="isShowCmtInputfn "></textarea>
    <van-button type="default" :disabled="comValue.length ===0" @click="send">发布</van-button>
</div>
  </div>
</template>

<script>
import { commentLikingAPI, commentDisLikingAPI, commentListAPI, sendCommentAPI } from '@/api/comments.js'
export default {
  data() {
    return {
      isShowCmtInput: false,
      totalCount: '',
      comValue: '',
      loading: false,
      finished: false,
      offset: null,
      shuju: this.arr
    }
  },
  methods: {
    async  onLoad() {
      const res = await commentListAPI({
        artId: this.$route.params.aid,
        offset: this.offset // 把offset偏移量带给后台
      })
      console.log(res)
      if (res.data.data.results < 10) {
        this.finished = true
        return
      }
      this.offset = res.data.data.last_id
      this.shuju = [...this.shuju, ...res.data.data.results]
      this.loading = false
    },
    isShowCmtInputfn() {
      setTimeout(() => {
        this.isShowCmtInput = false
      })
    },
    async send() {
      const res = await sendCommentAPI({
        artId: this.$route.params.aid,
        content: this.comValue
      })
      this.arr.unshift(res.data.data.new_obj)
      this.totalCount++
      this.comValue = ''
      this.movefn()
    },
    async  loveFn(bool, obj) {
      if (bool === true) { // 点了红心
        // 业务 => 取消红心
        // 调接口 => 取消红心
        // 显示 => 灰心
        obj.is_liking = false
        await commentDisLikingAPI({ comId: obj.com_id })
      } else { // 点了灰心
        // 业务 => 点亮红心
        // 调接口 => 点亮红心
        // 显示 => 红心
        obj.is_liking = true
        await commentLikingAPI({ comId: obj.com_id })
      }
    },
    async getCommentListFn() {
      const res = await commentListAPI({
        artId: this.$route.params.aid
      })
      this.totalCount = res.data.data.total_count || ''
      this.offset = res.data.data.last_id
    },
    movefn() {
      document.querySelector('.like-box').scrollIntoView()
    }
  },
  async created() {
    this.getCommentListFn()
  },
  props: {
    arr: {
      type: Array,
      default: () => []
    }
  }

}
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}
/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>
